^(95)Zr在土壤中的淋溶与垂直迁移  

Leaching and Vertical Transport of Zirconium-95 in Soils

作　　者：刘立丽[1] 史建君[1] 赵希岳[1] 张永熙[1] 

机构地区：[1]浙江大学原子核农业科学研究所农业部核农学重点开放试验室,杭州310029

出　　处：《环境科学》2001年第6期95-98,共4页Environmental Science

基　　金：国家自然科学基金项目 (39970 147)

摘　　要：采用土柱法研究了95Zr在浙江省有代表性的 3种土壤 (小粉土、红黄壤和海泥 )中的淋溶和垂直迁移及盐度对其行为的影响 .结果显示 :①淋溶后收集到的全部淋溶水中95Zr的含量较少 ,2 5 0ml、5 0 0ml和 75 0ml 3种不同淋溶水量下 ,小粉土约占原始引入量的 5 33%～ 7 68% ,海泥为 0 77%～ 1 32 % ,红黄壤几乎为 0 ;且随着总的淋溶水量的增加 ,被淋溶下的95Zr的总量变化不明显 ,表明95Zr一旦被土壤吸附 ,则不易被解吸 ;②滞留于土壤中的95Zr绝大部分分布在土壤表层 ,小粉土约有 4 5 99%～ 5 0 0 2 %的95Zr滞留于 0～ 0 4cm土层范围内 ,红黄壤和海泥则分别为 96 0 2 %～ 97 1 6%和 95 94 %～ 98 0 1 % ;③随淋溶水盐度的增加 ,表层土 ( 0～ 0 2cm)中95Zr的量明显提高 。The leaching and vertical transport of Zirconium 95 in three representational soils (paddy soil, red yellow earth and sea mud) in Zhejiang province and the influence of salinity on the activities of Zirconium 95 in sea mud were studied with soil pole installation. The results show that: ①The content of Zirconium 95 in collected leachate was low after passing through soil column with 250ml、500ml、750ml leaching amount. The amount of Zirconium 95 in collected leachate of paddy soil, sea mud and red yellow earth was about 5.33%～7 68%, 0 77%～1 32% and almost 0 of labelled amount respectively. And with increasing the total amount of leaching water, the content of Zirconium 95 in collected leachate varied indistinctively, which indicated that once Zirconium 95 was absorbed by soils, it was very difficult to desorb. ② In paddy soil, red yellow earth and sea mud, 45 99%～50 02%, 96 02%～97 16% and 95 94%～98 01% radioactivity of Zirconium 95 was concentrated in the 0 4cm upper layer soils respectively, which illustrated that most of Zirconium 95 remained in the surface soils. ③With the increase of salinity in leaching water, the amount of Zirconium 95 in surface soils (0～0 2cm) presented obviously increased, which demonstrated that increasing salinity could raise the adsorption rate of Zirconium 95 in soils.

关 键 词：^95ZR 土壤 淋溶 垂直迁移 盐度 核电站 裂变产物 

分 类 号：X833[环境科学与工程—环境工程] X53